Sampling & Data
How to Make Useful Random Test Data
Create safer sample numbers, dates, strings, IDs, and colors for software tests without copying real personal data.
Read guide →Guide collection
Random Sampling and Test Data
Random data can help with checks, lessons, demos, and software tests. It cannot fix a missing or unfair source list. These guides show how to prepare data, choose a sample, avoid repeats, and pick a useful output format.
Guides in this collection
Read the guides in this topic cluster in the order that best matches your task.
Sampling & Data
How to Generate Random Numbers Without Repeats
Learn when unique random numbers are needed, how the range limits the draw, and how to avoid duplicate results.
Read guide →Sampling & Data
Simple Random Sampling: A Practical Checklist
Use this short checklist to select an unbiased sample from a spreadsheet, survey list or QA dataset.
Read guide →Put it into practice
Useful tools for this topic
Put the ideas into practice with these related randomizer tools.
N%
Random Sample Generator
Select a simple random sample from pasted rows by exact count or percentage.
≠Unique Random Number Generator
Draw non-repeating integers from a range so every selected number appears exactly once.
T+Random Date and Time Generator
Produce complete random timestamps in human, ISO 8601 or Unix formats for testing and examples.
a9#Random String Generator
Create one or many random strings using a chosen length, alphabet, prefix and suffix.